The phrase "is devoted" implies a strong commitment or dedication to something or someone. Some synonyms for this phrase include "is committed," "is dedicated," "is loyal," "is faithful," "is steadfast," "is unwavering," and "is devotedly engaged." These words all suggest a deep investment in whatever or whoever one is devoted to. Some additional synonyms for "is devoted" could include "is passionate," "is fervent," "is enthusiastic," "is ardent," and "is zealous." Whatever word one chooses to use, the important thing is that it conveys a sense of wholehearted commitment and loyalty.